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Question:

The alkaline earth metal nitrate that does not crystallise with water molecules, is: Ca(NO3)2, Ba(NO3)2, Mg(NO3)2, Sr(NO3)2

Mg(NO3)2

Sr(NO3)2

Ca(NO3)2

Ba(NO3)2

Solution:

Smaller in size of cation, more water molecules will crystallize. Due to its largest size of Ba2+ ion, Ba(NO3)2 doesn't crystallize with water molecules. Hence, the correct option is D.